Among what other people have said, mint gives a lingering “cold” flavor in your mouth that is easily associated with cleanliness.
In other words, it’s the “reward” part of the [habit loop](https://cdn-images-1.medium.com/v2/resize:fit:854/1*P-VIQhXqfQF6UJzcER8WKA.png). Once you develop the habit of brushing the teeth, you start craving that minty flavor, and that craving is partly what encourages you to brush your teeth regularly.
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